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Old 07-25-2011, 12:35 PM
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Default What do you guys think of this design?

Well I recently purchased a pair of American Bass XFL 15's and am currently designing a box for them. The box will be a daily driver and I will be running 2000 RMS to the subs. This is my first ported design so bare with me haha. I was suggested by another member to do around 7 cubes. I came up with a box 37"x18"x24" outside dimensions. That is about 7.6 cubes before any displacement. Now here is where I'm confused. Since I'm doing a ported enclosure I will (obviously) be needing a port haha. I want to keep it as cheap and simple as possible so I came up with a square port. Port dimensions are 5.5" high x 5.5" wide x 5.25" deep tuned to 33 hz. This would give me about 115 sq in of port area which seems like it should be good but I guess I'm asking you guys what you think of this design? Any improvements I could make right off the bat? Thanks for any advice in advanced
Specs in short:
2 American Bass XFL 15's
2000 watts RMS
7.6 cubes before displacement
Square port 5.5" x 5.5" x 5.25" deep tuned to 33 hz 115 sq in of port.
How will this square port do? I want to be able to hit the lows hard but still play music thanks!

Last edited by Bass Head; 07-25-2011 at 01:29 PM.
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Old 07-26-2011, 09:24 PM
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That square port will do fine but i only got 30sq of port using torres box calculator.
11x7x16=36hz 77sq of port box is the measurements your supplied with just a bigger port. I assumed you was doing sub an port back or forward however your doing it but i am sure the tuning shouldn't change at all. I think the box your wanting to build is gonna be sweet if your building it for 15's it will def slam. If ya need a visual stimulation lemme know an i will put something down in google sketch for ya.
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Old 07-27-2011, 06:01 AM
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I could design an enclosure for you if youd like. Much more information will be needed though before a certain enclosure is decided as optimal. Shoot me a PM.
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Old 07-27-2011, 12:31 PM
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Quote:
Originally Posted by supadave View Post
That square port will do fine but i only got 30sq of port using torres box calculator.
11x7x16=36hz 77sq of port box is the measurements your supplied with just a bigger port. I assumed you was doing sub an port back or forward however your doing it but i am sure the tuning shouldn't change at all. I think the box your wanting to build is gonna be sweet if your building it for 15's it will def slam. If ya need a visual stimulation lemme know an i will put something down in google sketch for ya.
Hmm I don't know if theres a certain formula for finding port sq in but I just went 5.5 times 5.25 to get the surface area of one side of the port, which is 28.875. Multiply that by four to get 115.5! Does that sound right?
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Originally Posted by surreal View Post
I could design an enclosure for you if youd like. Much more information will be needed though before a certain enclosure is decided as optimal. Shoot me a PM.
I already kinda got my box designed but thanks alot for the offer.
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Old 07-27-2011, 12:41 PM
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Quote:
Originally Posted by Bass Head View Post
Hmm I don't know if theres a certain formula for finding port sq in but I just went 5.5 times 5.25 to get the surface area of one side of the port, which is 28.875. Multiply that by four to get 115.5! Does that sound right?

I already kinda got my box designed but thanks alot for the offer.

WRONG I will round off to simplify. You have 5 inches X 5 inches. You MUST multiply both the integer and the units.

5X5 = 25 .
Inches X Inches = inches ^2 .

SO you have 25 inches ^2

If you needed to find volume you'd multiply another integer + inches again, hence you'd have inches ^3

Cheap solution is use sono tube for a large round port. 12" round port would be good for a pair of 15's in 6 cube. You'd want it between 26 and 16" long depending on your desired tuning, but sono tube is cheap and easy to tune up (cut it back with utility knife) or tune down (carve it out and insert a longer tube)
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Old 07-27-2011, 12:47 PM
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Quote:
Originally Posted by hispls View Post
WRONG I will round off to simplify. You have 5 inches X 5 inches. You MUST multiply both the integer and the units.

5X5 = 25 .
Inches X Inches = inches ^2 .

SO you have 25 inches ^2

If you needed to find volume you'd multiply another integer + inches again, hence you'd have inches ^3

Cheap solution is use sono tube for a large round port. 12" round port would be good for a pair of 15's in 6 cube. You'd want it between 26 and 16" long depending on your desired tuning, but sono tube is cheap and easy to tune up (cut it back with utility knife) or tune down (carve it out and insert a longer tube)
Well is port area the actual entire area of the port? In that case wouldn't that 25 be multiplied by four to account for each side of the port?
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Old 07-27-2011, 12:49 PM
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Quote:
Originally Posted by Bass Head View Post
Well is port area the actual entire area of the port? In that case wouldn't that 25 be multiplied by four to account for each side of the port?
dude listen. its not the entire port, its the area of the opening of the port
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Old 07-27-2011, 12:53 PM
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dude listen. its not the entire port, its the area of the opening of the port
Oh well what the hell why didn't any tell me that!! Lol. SO the actual area of the port doesn't mean shit? Looks like I'll have to design a new port....
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Old 07-27-2011, 12:58 PM
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Its the cross-sectional area. What you are referring to is volume.

And yes, the area of the port is very important.. It controls more than just audible chuffing.
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Old 07-27-2011, 12:58 PM
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Quote:
Originally Posted by Bass Head View Post
Oh well what the hell why didn't any tell me that!! Lol. SO the actual area of the port doesn't mean shit? Looks like I'll have to design a new port....
Radiating area of the port would be a more accurate description of what you are after...
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